Holographic scanner disc with different facet areas
US4415224A · kind A · utility
64Cited by
2References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 8, 1981 |
| Grant date | Nov 15, 1983 |
| Priority date | — |
| Expiry date | Jun 8, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/106
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A scan pattern for a bar code scanner is produced by the combination of a coherent light source, a rotating disc with holographic facets and an array of fixed, beam folding mirrors. Light reflected from a bar code label follows a retroreflective path to a photodetector within the scanner. To reduce variations in the amount of light collected through different facets, the areas of the facets are varied as a function of beam elevation and beam path length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.